1)Design No. 30 is applied on PVS-0B to make the pump more compact and lighter, and reduce noise.2)Production of PVS-3B has been discontinued. Use PZS-3B.3)Pressure adjustment 3 type has been added to PVS-1B-22 and PVS-2B-45. (Design No. 20 is applied only on PVS-2B-45*3.) FeaturesEnergy-saving Type with Drastically Reduced Loss A NACHI-proprietary semi-circular barrel swash plate that receives pressure on its surface ensures a stable discharge volume at all times. This eliminates excess discharge volume, and enables the effective use of power corresponding to the load cycle. This "energy-saving type" conserves energy, reduces power loss, and helps to reduce hydraulic costs. Silent Type That Demonstrates Its Power QuietlyProprietary low-noise mechanisms are incorporated on the shoe, swash plate, valve plate, and other locations to ensure silent operation. In particular, a semi-circular barrel swash plate stabilizes operation characteristics to ensure silent operation. Specifications:The common pump model no# we have stock: PVS-0B-8N0-30PVS-1A-16N3-12PVS-1A-22N1-12PVS-1A-22N2-11PVS-1B-16PVS-1B-16N1-Z-12PVS-1B-16N2Q1-12PVS-1B-16N3Q1-12PVS-1B-22N0-12PVS-1B-22N2-12PVS-2A-35N3-12PVS-2B-35N1-12PVS-2B-35N2-12PVS-2B-35N3-12PVS-2B-35N3-Z-12PVS-2B-45N3-12 For more technical information, please download the below datasheet: NACHI PVS Series Variable Volume Piston Pumps datasheet